# Rice 1.0.0 - Ruby Interface for C++ Extensions **URL:** \ **Category:** Ruby\ **Created:** [February 11, 2008, 1:47pm UTC](https://www.ruby-forum.com/t/rice-1-0-0-ruby-interface-for-c-extensions/128775 "2008-02-11T13:47:23Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![jruyle](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/d2c977/32.png) [@jruyle](https://www.ruby-forum.com/u/jruyle)\ **Post date:** [February 11, 2008, 1:47pm UTC](https://www.ruby-forum.com/t/rice-1-0-0-ruby-interface-for-c-extensions/128775/1 "2008-02-11T13:47:23Z")
# Rice: Ruby Interface for C++ Extensions What is Rice? Rice is a C++ interface to Ruby’s C API. It provides a type-safe and exception-safe interface in order to make embedding Ruby and writing Ruby extensions with C++ easier. It is similar to Boost.Python in many ways, but also attempts to provide an object-oriented interface to all of the Ruby C API. What Rice gives you: - A simple C+±based syntax for wrapping and defining classes - Automatic conversion of exceptions between C++ and Ruby - Smart pointers for handling garbage collection - Wrappers for most builtin types to simplify calling code Documentation: [http://rice.rubyforge.org](http://rice.rubyforge.org) Project Page: [http://rubyforge.org/projects/rice](http://rubyforge.org/projects/rice) How do you get Rice? gem install rice Note: Rice does require a C++ compiler. See the Documentation page for more details. How simple of a syntax? wrapper.cpp #include “rice/Class.hpp” class MyWrapper { public: MyWrapper() { } ``` void doThis() { } int doThat(int a, float b) { } ``` }; extern “C” void Init\_wrapper() { define\_class(“MyWrapper”) .define\_constructor(Constructor()) .define\_method(“do\_this”, &MyWrapper::doThis) .define\_method(“do\_that”, &MyWrapper::doThat); } extconf.rb require ‘mkmf-rice’ create\_makefile(“wrapper”) test.rb require ‘wrapper’ c = MyWrapper.new c.do\_this c.do\_that Building Ruby extensions have never been so easy! ---
**Author:** ![jruyle](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/d2c977/32.png) [@jruyle](https://www.ruby-forum.com/u/jruyle)\ **Post date:** [February 11, 2008, 8:52pm UTC](https://www.ruby-forum.com/t/rice-1-0-0-ruby-interface-for-c-extensions/128775/2 "2008-02-11T20:52:55Z")
I have error during installation process: /usr/bin/ld: …/…/rice/librice.a(Class.o): relocation R\_X86\_64\_32 against `a local symbol’ can not be used when making a shared object; recompile with -fPIC I’m on 64bit architecture. Should I file a bug on rubyforge? – Rados³aw Bu³at [http://radarek.jogger.pl](http://radarek.jogger.pl) - mój blog ---
**Author:** ![jruyle](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/d2c977/32.png) [@jruyle](https://www.ruby-forum.com/u/jruyle)\ **Post date:** [February 11, 2008, 9:18pm UTC](https://www.ruby-forum.com/t/rice-1-0-0-ruby-interface-for-c-extensions/128775/3 "2008-02-11T21:18:58Z")
2008/2/11 Rados³aw Bu³at [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > Rados³aw Bu³at > > [http://radarek.jogger.pl](http://radarek.jogger.pl) - mój blog Yeah, go ahead and file a bug. Please include your system information including gcc version. Thanks Jason ---
**Author:** ![jruyle](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/d2c977/32.png) [@jruyle](https://www.ruby-forum.com/u/jruyle)\ **Post date:** [February 11, 2008, 10:22pm UTC](https://www.ruby-forum.com/t/rice-1-0-0-ruby-interface-for-c-extensions/128775/4 "2008-02-11T22:22:51Z")
On Tue, Feb 12, 2008 at 04:52:12AM +0900, Rados?aw Bu?at wrote: > I have error during installation process: > /usr/bin/ld: …/…/rice/librice.a(Class.o): relocation R\_X86\_64\_32 > against `a local symbol’ can not be used when making a shared object; > recompile with -fPIC I can reproduce this on SuSE 10.1 x86\_x64. I’ll see what I can do about fixing it. We should have been using the fPIC flag all along, since we’re building shared objects. Paul ---
**Author:** ![jruyle](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/d2c977/32.png) [@jruyle](https://www.ruby-forum.com/u/jruyle)\ **Post date:** [February 11, 2008, 10:49pm UTC](https://www.ruby-forum.com/t/rice-1-0-0-ruby-interface-for-c-extensions/128775/5 "2008-02-11T22:49:04Z")
On Tue, Feb 12, 2008 at 06:20:12AM +0900, Paul B. wrote: > We should have been using the fPIC flag all along, since we’re building > shared objects. Here’s a patch which you should be able to apply to the tarball: # Index: test/Makefile.am — test/Makefile.am (revision 173) +++ test/Makefile.am (working copy) @@ -32,6 +32,9 @@ -I… $(RUBY\_CPPFLAGS) +AM\_CXXLAGS = \ - ``` $(RUBY_CXXFLAGS) ``` - AM\_LDFLAGS = $(RUBY\_LDFLAGS) -L…/rice @@ -41,4 +44,3 @@ $(RUBY\_LIBS) $(RUBY\_LIBRUBYARG) - # Index: rice/Makefile.am — rice/Makefile.am (revision 173) +++ rice/Makefile.am (working copy) @@ -110,3 +110,5 @@ AM\_CPPFLAGS = @RUBY\_CPPFLAGS@ # +AM\_CXXFLAGS = @RUBY\_CXXFLAGS@ + Index: ruby.ac — ruby.ac (revision 173) +++ ruby.ac (working copy) @@ -23,6 +23,7 @@ RUBY\_CONFIG\_ARCHDIR=`RUBY_CONFIG(archdir)` RUBY\_CONFIG\_LIBDIR=`RUBY_CONFIG(libdir)` RUBY\_CONFIG\_BINDIR=`RUBY_CONFIG(bindir)` +RUBY\_CONFIG\_CFLAGS=`RUBY_CONFIG(CFLAGS)` RUBY\_CONFIG\_LIBS=`RUBY_CONFIG(LIBS)` RUBY\_CONFIG\_DLDLIBS=`RUBY_CONFIG(DLDLIBS)` RUBY\_CONFIG\_LDFLAGS=`RUBY_CONFIG(LDFLAGS)` @@ -32,6 +33,12 @@ RUBY\_CPPFLAGS="-I${RUBY\_CONFIG\_ARCHDIR}" AC\_SUBST(RUBY\_CPPFLAGS) +RUBY\_CFLAGS="${RUBY\_CONFIG\_CFLAGS}" +AC\_SUBST(RUBY\_CFLAGS) + +RUBY\_CXXFLAGS="${RUBY\_CONFIG\_CFLAGS}" +AC\_SUBST(RUBY\_CXXFLAGS) + RUBY\_LDFLAGS="-L${RUBY\_ARCHDIR} -L${RUBY\_CONFIG\_LIBDIR} ${RUBY\_LDFLAGS}" AC\_SUBST(RUBY\_LDFLAGS) Rice and the samples now build fine, though two unit tests still fail: To\_From\_Ruby:int\_from\_ruby: integer -4611686018427387904 too small to convert to `int' To_From_Ruby:unsigned_int_from_ruby: integer 13835058055282163712 too big to convert to`unsigned int’ We will be sure to test x86\_64 better for the next release. Paul